Caldwell, E. C. (1952). Course of study and teacher's manual for United States history and government 7z: Senior high schools. Sacramento City Unified School District.
Citazione stile Chigago Style (17a edizione)Caldwell, Esther C. Course of Study and Teacher's Manual for United States History and Government 7z: Senior High Schools. Sacramento, California: Sacramento City Unified School District, 1952.
Citatione MLA (9a ed.)Caldwell, Esther C. Course of Study and Teacher's Manual for United States History and Government 7z: Senior High Schools. Sacramento City Unified School District, 1952.
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